TY - JOUR
T1 - Readily prepared metallo-supramoleculare triple-helicates designed to exhibit spin-crossover behaviour
AU - Tuna, F
AU - Lees, FR
AU - Clarkson, GJ
AU - Hannon, Michael
PY - 2004/1/1
Y1 - 2004/1/1
N2 - New dinuclear supramolecular cylinders have been designed to exhibit spin-crossover behaviour, a form of molecular bistability. This has been achieved within the framework of our imine-based approach to supramolecular architecture by switching from pyridylimine systems to imidazolimines. Spin-crossover behaviour is achieved while retaining the simplicity and ease-of-synthesis of our molecular design. The imidazole groups used also introduce additional NH groups that engage in hydrogen-bonding to anions and solvents. In the case of the iron(II) tetrafluoroborate complex this hydrogen bonding links supramolecular cylinders into an extended two-dimensional array. Consistent with this, a sharper spin-crossover transition is observed for this compound than for the corresponding hexafluorophosphate salt. More subtle anion effects are indicated in the perchlorate salt which gives a two-step spin conversion, thereby displaying tristability.
AB - New dinuclear supramolecular cylinders have been designed to exhibit spin-crossover behaviour, a form of molecular bistability. This has been achieved within the framework of our imine-based approach to supramolecular architecture by switching from pyridylimine systems to imidazolimines. Spin-crossover behaviour is achieved while retaining the simplicity and ease-of-synthesis of our molecular design. The imidazole groups used also introduce additional NH groups that engage in hydrogen-bonding to anions and solvents. In the case of the iron(II) tetrafluoroborate complex this hydrogen bonding links supramolecular cylinders into an extended two-dimensional array. Consistent with this, a sharper spin-crossover transition is observed for this compound than for the corresponding hexafluorophosphate salt. More subtle anion effects are indicated in the perchlorate salt which gives a two-step spin conversion, thereby displaying tristability.
UR - http://www.scopus.com/inward/record.url?scp=9244231758&partnerID=8YFLogxK
U2 - 10.1002/chem.200400518
DO - 10.1002/chem.200400518
M3 - Article
C2 - 15472936
SN - 1521-3765
VL - 10
SP - 5737
EP - 5750
JO - Chemistry: A European Journal
JF - Chemistry: A European Journal
ER -